A teenage boy and a 65-year-old man were gunned down Tuesday afternoon outside their Southwest Side home, according to Chicago police. The Cook County medical examiner’s office identified the victims as Juan A. Medina Jr., 14, and Mario Medina. Both victims were standing outside in the 3500 block of West 61st Place just before 4:30 p.m. when two gunmen inside a gray vehicle opened fire before .